Screen and method for manufacturing the same

Abstract

A screen for displaying an image by projection light includes: a selectively reflective layer having reflection properties with respect to light in a specific wavelength region corresponding to the projection light, and having absorption properties with respect to light in a wavelength region other than the specific wavelength region. And the selectively reflective layer includes an optical multilayer film having a dielectric film and a light-absorbing thin film having transmission properties, and a reflective layer for reflecting light which has passed through the optical multilayer film.

1. A screen for displaying an image projected thereon by projection light, comprising:
 a substrate; and 
 a selectively reflective layer on said substrate, said selectively reflective layer comprising a reflective layer and a optical multilayer film, said optically multilayer film comprising a dielectric film and a light-absorbing thin film, 
 wherein, 
 said selectively reflective layer reflects light having a specific wavelength or wavelengths corresponding to said projection light, and absorbs light having a wavelength or wavelengths other than said specific wavelength or wavelengths, 
 said light-absorbing thin film is 5 nm to 20 nm thick and is formed from a material having a refractive index of 1 or more and an absorption coefficient of 0.5 or more, and 
 said reflective layer reflects light which has passed through said optical multilayer film. 
 
   
   
     2. A screen according to  claim 1 , wherein said light-absorbing thin film is formed from a material selected from the group consisting of Nb, Nb alloys, C, Cr, Fe, Ge, Ni, Pd, Pt, Rh, Ti, TiN, TiN x W y , Mn, Ru, and PbTe. 
   
   
     3. A screen according to  claim 1 , wherein said dielectric film is formed from a material selected from the group consisting of Nb 2 O 5 , TiO 2 , Ta 2 O 5 , Al 2 O 3 , and SiO 2 . 
   
   
     4. A screen according to  claim 1 , wherein said reflective layer is a metallic substrate. 
   
   
     5. A screen according to  claim 1 , wherein said reflective layer is a metallic film. 
   
   
     6. A screen according to  claim 5 , wherein said reflective layer is formed from a material selected from the group consisting of Al, Nb, or Ag, or an alloy thereof. 
   
   
     7. A screen according to  claim 1 , further comprising a diffusion layer for scattering the reflected light from said selectively reflective layer. 
   
   
     8. A screen according to  claim 7 , further comprising an adhesive layer formed between said diffusion layer and said selectively reflective layer, combining both layers and including a coloring material which absorbs the light at said specific wavelength or wavelengths. 
   
   
     9. A screen according to  claim 1 , wherein a plurality of protruding portions or depressed portions is formed on a surface of said reflective layer where said optical multilayer film is formed thereon for scattering said reflected light from said selectively reflective layer. 
   
   
     10. A screen according to  claim 1 , wherein said specific wavelength region includes respective wavelength regions for a red light, green light, and blue light. 
   
   
     11. A screen according to  claim 10 , wherein said selectively reflective layer has reflection properties such that reflection intensities in said wavelength or wavelengths are adjusted according to the intensities of said projection light of a light source in the wavelength or wavelengths of the respective RGB colors. 
   
   
     12. A screen according to  claim 1 , wherein said specific wavelength or wavelengths having absorption properties includes the bright line peak of light from a fluorescent light. 
   
   
     13. A screen according to  claim 1 , wherein said wavelength or wavelengths having absorption properties is aninged at the wavelengths between a wavelength of the bright line peak of red component and that of green component, and between a wavelength of the bright line peak of green component and that of blue component of said projection light respectively. 
   
   
     14. A method for manufacturing a screen comprising the steps of:
 providing a metallic substrate; and 
 forming on the substrate, a selectively reflective layer which reflects light having a specific wavelength or wavelengths and absorbs light having a wavelength or wavelengths other than the specific wavelength or wavelengths, 
 wherein, 
 the step fir firming the selectively reflective layer comprises firming an optical multilayer film including a dielectric film and a 5 nm to 20 nm thick light-absorbing thin film formed from a material having a refractive index of 1 or more and an absorption coefficient of 0.5 or more. 
 
   
   
     15. A method for manufacturing a screen according to  claim 14 , wherein said optical multilayer film is formed by sputtering method. 
   
   
     16. A method for manufacturing a screen according to  claim 14 , wherein said metallic substrate is formed from a material selected from the group consisting of Al, Nb, or Ag, or an alloy thereof. 
   
   
     17. A method for manufacturing a screen according to  claim 14 , wherein said light-absorbing thin film is formed from a material selected from the group consisting of Nb, Nb alloys, C, Cr, Fe, Ge, Ni, Pd, Pt, Rh, Ti, TiN, TiN x W y , Mn, Ru, and PbTe. 
   
   
     18. A method for manufacturing a screen according to  claim 14 , wherein said dielectric film is formed from a material selected from the group consisting of Nb 2 O 5 , TiO 2 , Ta 2 O 5 , Al 2 O 3 , and SiO 2 . 
   
   
     19. A method for manufacturing a screen according to  claim 14 , further comprising a step for forming a diffusion layer on said optical multilayer film for scattering light. 
   
   
     20. A method for manufacturing a screen according to  claim 19 , wherein said step for forming a diffusion layer comprises a step for bonding said diffusion layer to said optical multilayer film through an adhesive layer having a coloring material which absorbs light in said specific wavelength region. 
   
   
     21. A method for manufacturing a screen according to  claim 14 , wherein a plurality of protruding portions or depressed portions is formed on a surface of said metal substrate where said optical multilayer film is formed. 
   
   
     22. A method for manufacturing a screen according to  claim 14 , wherein said specific wavelength or wavelengths includes respective wavelength or wavelengths for a red light, green light, and blue light. 
   
   
     23. A method for manufacturing a screen according to  claim 14 , wherein said specific wavelength or wavelengths having absorption properties includes the bright line peak of light from a fluorescent light. 
   
   
     24. A method for manufacturing a screen according to  claim 14 , wherein said wavelength or wavelengths having absorption properties is arranged at the wavelengths between a wavelength of the bright line peak of red component and that of green component, and between a wavelength of the bright line peak of green component and that of blue component of a possible light source respectively. 
   
   
     25. A method for manufacturing a screen, said method comprising the steps of:
 providing a metallic substrate; and 
 forming, on the substrate, a selectively reflective layer which reflects light having a specific wavelength or wavelengths and absorbs light having a wavelength or wavelengths other than said specific wavelength or wavelengths, 
 wherein, 
 the step for forming the selectively reflective layer comprises forming an optical multilayer film including a dielectric film and a 5 nm to 20 nm thick light-absorbing thin film formed from a material having a refractive index of 1 or more and an absorption coefficient of 0.5 or more. 
 
   
   
     26. A method for manufacturing a screen according to  claim 25 , wherein said metallic film and said optical multilayer film are formed by sputtering method. 
   
   
     27. A method for manufacturing a screen according to  claim 25 , wherein said metallic film is formed from a material selected from the group consisting of Al, Nb, or Ag, or an alloy thereof. 
   
   
     28. A method for manufacturing a screen according to  claim 25 , wherein said light-absorbing thin film is formed from a material selected from the group consisting of Nb, Nb alloys, C, Cr, Fe, Ge, Ni, Pd, Pt, Rh, Ti, TiN, TiN x W y , Mn, Ru, and PbTe. 
   
   
     29. A method for manufacturing a screen according to  claim 25 , wherein said dielectric film is formed from a material selected from the group consisting of Nb 2 O 5 , TiO 2 , Ta 2 O 5 , Al 2 O 3 , and SiO 2 . 
   
   
     30. A method for manufacturing a screen according to  claim 25 , further comprising a step for forming a diffusion layer on said optical multilayer film for scattering light. 
   
   
     31. A method for manufacturing a screen according to  claim 30 , wherein said step for forming a diffusion layer comprises a step for bonding said diffusion layer to said optical multilayer film through an adhesive layer having a coloring material which absorbs light at said specific wavelength or wavelengths. 
   
   
     32. A method for manufacturing a screen according to  claim 25 , wherein a plurality of protruding portions or depressed portions is formed on a surface of said substrate where said metallic film is formed. 
   
   
     33. A method for manufacturing a screen according to  claim 25 , wherein said specific wavelength or wavelengths includes respective wavelength for a red light, green light, and blue light. 
   
   
     34. A method for manufacturing a screen according to  claim 25 , wherein said specific wavelength or wavelengths having absorption properties includes the bright line peak of light from a fluorescent light. 
   
   
     35. A method for manufacturing a screen according to  claim 25 , wherein said wavelength or wavelengths having absorption properties is arranged at the wavelengths between a wavelength of the bright line peak of red component and that of green component, and between a wavelength of the bright line peak of green component and that of blue component of a possible light source respectively. 
   
   
     36. A method for manufacturing a screen, said method comprising the steps of:
 providing a diffuser panel; and 
 forming a selectively reflective layer which reflects light having a specific wavelength or wavelengths and absorbs light having a wavelength or wavelengths other than the specific wavelength or wavelengths, 
 wherein, 
 the step for forming a selectively reflective layer comprises forming, on the back surface of the diffuser panel, an optical multilayer-film including a dielectric film and a 5 nm to 20 nm thick light-absorbing thin film formed from a material having a refractive index of 1 or more and an absorption coefficient of 0.5 or more, and forming a metallic film on the optical multilayer film. 
 
   
   
     37. A method for manufacturing a screen according to  claim 36 , wherein said optical multilayer film and said metallic film are formed by sputtering method. 
   
   
     38. A method for manufacturing a screen according to  claim 36 , wherein said light-absorbing thin film is formed from a material selected from the group consisting of Nb, Nb alloys, C, Cr, Fe, Ge, Ni, Pd, Pt, Rh, Ti, TiN, TiN x W y , Mn, Ru, and PbTe. 
   
   
     39. A method for manufacturing a screen according to  claim 36 , wherein said dielectric film is formed from a material selected from the group consisting of Nb 2 O 5 , TiO 2 , Ta 2 O 5 , Al 2 O 3 , and SiO 2 . 
   
   
     40. A method for manufacturing a screen according to  claim 36 , wherein said metallic film is formed from a material selected from the group consisting of Al, Nb, or Ag, or an alloy thereof. 
   
   
     41. A method for manufacturing a screen according to  claim 36 , wherein said specific wavelength or wavelengths includes respective wavelength or wavelengths for a red light, green light, and blue light. 
   
   
     42. A method for manufacturing a screen according to  claim 36 , wherein said specific wavelength or wavelengths having absorption properties includes the bright line peak of light from a fluorescent light. 
   
   
     43. A method for manufacturing a screen according to  claim 36 , wherein said wavelength or wavelengths having absorption properties is arranged at the wavelengths between a wavelength of the bright line peak of red component and that of green component, and between a wavelength of the bright line peak of green component and that of blue component of a possible light source respectively.